diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/effects/SkGaussianEdgeShader.cpp | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/src/effects/SkGaussianEdgeShader.cpp b/src/effects/SkGaussianEdgeShader.cpp index e519598f1b..1990fbf67b 100644 --- a/src/effects/SkGaussianEdgeShader.cpp +++ b/src/effects/SkGaussianEdgeShader.cpp @@ -11,6 +11,10 @@ /** \class SkGaussianEdgeShaderImpl This subclass of shader applies a Gaussian to shadow edge + + The radius of the Gaussian blur is specified by the g and b values of the color, + where g is the integer component and b is the fractional component. The r value + represents the max final alpha. */ class SkGaussianEdgeShaderImpl : public SkShader { public: @@ -65,20 +69,13 @@ public: GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; - fragBuilder->codeAppendf("vec4 output = %s;", args.fInputColor); - // outside the outer edge - fragBuilder->codeAppendf("if (%s.z <= 0) {", fragBuilder->distanceVectorName()); - fragBuilder->codeAppend("output *= 0.0;"); - // inside the stroke - fragBuilder->codeAppendf("} else if (%s.w > 0) {", fragBuilder->distanceVectorName()); - fragBuilder->codeAppendf("float factor = %s.w/(%s.z + %s.w);", - fragBuilder->distanceVectorName(), - fragBuilder->distanceVectorName(), + fragBuilder->codeAppendf("vec4 color = %s;", args.fInputColor); + fragBuilder->codeAppend("float radius = color.g*255.0 + color.b;"); + + fragBuilder->codeAppendf("float factor = 1.0 - clamp(%s.z/radius, 0.0, 1.0);", fragBuilder->distanceVectorName()); fragBuilder->codeAppend("factor = exp(-factor * factor * 4.0) - 0.018;"); - fragBuilder->codeAppend("output *= factor;"); - fragBuilder->codeAppend("}"); - fragBuilder->codeAppendf("%s = output;", args.fOutputColor); + fragBuilder->codeAppendf("%s = factor*vec4(0.0, 0.0, 0.0, color.r);", args.fOutputColor); } static void GenKey(const GrProcessor& proc, const GrGLSLCaps&, |